Lesson eLearning

In a region, average annual rainfall is 1200 mm. If 30% of this rainfall is lost to evaporation, what percentage of rainfall actually reaches the ground?

hard MCQ 3 marks Class 4 · EVS · Too Much Water Too Little Water
  1. 70%
  2. 80%
  3. 90%
  4. 100%
Answer
70%

The correct answer is 70% — Percentage of rainfall that reaches ground = (840 / 1200) × 100 = 70%.

Step-by-step solution

  1. Total rainfall = 1200 mm.
  2. Evaporation loss = 30% of 1200 mm = 0.30 × 1200 = 360 mm.
  3. Rainfall reaching ground = 1200 – 360 = 840 mm.
  4. Percentage of rainfall that reaches ground = (840 / 1200) × 100 = 70%.
Common mistake: Adding instead of subtracting evaporation percentage

Concept tested: Evaporation loss in water cycle

Published · How this solution was prepared and checked

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